Now more than ever, consumer products ranging from toothpaste to potato chips and cleaning wipes to nail polish can be delivered Industry Insights Medical. Spectroscopy to Clinical Chemistry Analyzers The medical industry is experiencing massive growth, especially in the Lab Automation space. The need for Bearing Preload and Rigidity This post is a continuation of the Koyo Bearings series, you can find the original post on October 5, September 21, In all corners of the world, healthcare has been one of the most important industries of the last year and a September 14, Load More By Carlicia Layosa.
Be sure to catch August 31, Bearing Dimensions and Service Life Continuing our Koyo Bearings series with part 3, the team reviews dimensions and service life in July 20, Linear guides are a versatile and most often crucial component for a variety of applications in the medical, automotive, warehouse automation, June 22, The open belt drive is used with shafts arranged parallel and rotating in the same direction.
In that case, the driver pulls the belt from one side and delivers it to the other side. Thus, the tension in the lower side belt will be higher than the upper side belt. The lower side belt is known as the tight side belt while the upper side belt is known as the slack side belt. When the shafts are too far apart, the bottom of the belt should be the tight side and the upper side should be the slack side.
This is so, when the upper side becomes the dull side, it will relax due to its own weight and thus increase the arc of contact. Cross or twisted belt drives are used with rotating shafts in parallel and opposite directions. In this case, the driver pulls the belt from one side and delivers it to the other side. Thus, the tension at the Bottom Side of the belt will be higher than at the upper side of the belt. The belt is known as the tight side due to high tension, while the belt due to low tension is known as the slack side.
This type of belt drive employs a belt when two parallel shafts have to rotate in the opposite direction. At the junction where the belt crosses, it rubs against itself and wears off. To avoid excessive wear, the shafts should be kept at maximum distance from each other and operated at very low speeds. A little consideration will show that at a point where the belt crosses, it rubs against each other and there will be excessive wear and tear.
This type of belt drives is used when the driven or machine shaft is to be started or stopped whenever desired without interfering with the driving shaft. A pulley which is keyed to the machine shaft is called a fast pulley and run at the same speed as that of the machine shaft.
A loose pulley runs freely over the machine shaft and is incapable of transmitting any power. When the driven shaft is required to be stopped, the belt is pushed on to the loose pulley by means of a sliding bar having belt forks. A step or cone pulley drive is used to change the speed of the driven shaft, while the main or driving shaft moves at a constant speed.
This is accomplished by shifting the belt from one part of the steps to another. A step cone pulley is an integral casting consisting of three or different numbers of different sizes of pulleys adjacent to each other, as shown in fig.
A set of driven cone pulleys is placed upside down on the drive shaft. An endless belt will be wrapped around a pair of pulleys. By shifting the belt from one pair of pulleys to another, the speed of the driven shaft can be varied.
The diameter of the pulleys driving and operated is such that the same belt will operate when transferred over pairs of different pulleys. This increases the arc of contact and thus stress resulting in an increase in power transmission. Quarter turn belt drives are also known as right-angle belt drives.
Miles Budimir. Senior Editor. A tried and true power transmission technique is the traditional belt and pulley system. Applications often drive innovations in belt and pulley technology. Belt drives Contents show. Belt drives. Belt Drives 2. Types of Belts.
PPT on belt drive. Types of Belt Drives 4. Open Belt Drive. Cross Belt Drive. Fast and Loose Pulley Drive. Jockey Pulley Drive. Slip in Belts. Creep in Belts. Materials Used For Belts. V-Belts 8. Selection of Belt Drive. Thanks Reply. When will this article be finished? Loading Comments
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